USE OF LABOR-SAVING APPARATUS 



55 



In order that country-wide conditions may be satisfactorily met, 

 the present type of derrick has been made available in two general 

 types which are known as the "middle" and "corner" types for use, 

 as the names imply, from the rear middle or corner of the truck. 

 Each of these types are further available in light and heavy weights, 

 depending upon the lengths and the kinds of poles, cedar or chestnut 

 or other kinds of similar weights, that are generally used in any par- 

 ticular part of the country. 



As contrasted with the early type of derrick, the present types 

 weigh from 370 to 520 pounds, depending upon the size used, 



Fig. 2 — Erecting Pole at Distance from Truck, One Derrick Member on Ground 



and are capable of readily and safely handling any load within 

 the limits of the winch rope capacity, which leaves a satisfactory 

 margin when doing practically any work for which the derrick has a 

 place in telephone construction. Each of the four classes of derricks 

 above mentioned is designed with a view to making its operation as 

 rapid as is consistent with safety. The chauffeur and one man can 

 remove the derrick members from the carrying racks provided on 

 the truck, assemble them and erect the derrick ready for work in 

 from three to four minutes. The disassembling of the derrick re- 

 quires about the same length of time. 



